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For successful seedlings,
see the growing notes at the bottom of the page!
Common white snakeroot (Ageratina altissima) is a native perennial plant found in shaded forests and along roadsides in North America. It can grow between 30 and 120 centimetres tall and is recognized for its dense clusters of small white flowers that bloom from late July through September. Its dark green, oval, toothed leaves and straight, unbranched stems provide a vertical element in shaded gardens. The white snakeroot's flowers are particularly attractive to pollinators such as bees and butterflies.
Medicinal and Culinary Uses
White snakeroot has no culinary or medicinal use due to its toxicity. It contains a toxic compound called tremetone, which can cause poisoning in animals, especially livestock, and humans through contaminated milk, historically known as "milk sickness."
Ecological Roles
Despite its toxicity, white snakeroot plays an important role in forest and shaded ecosystems. Its nectar-rich white flowers are a valuable resource for pollinators, particularly bees and butterflies, in late summer. This plant also supports some specialized herbivorous insects. After flowering, its seeds are dispersed by the wind, allowing it to spread in forests and clearings.
White snakeroot seeds require cold stratification to ensure germination. See the cultivation notes below for more details.
Akène cannot assume any responsibility for the use of plants for therapeutic purposes. Always seek advice from a professional before using a medicinal or edible plant.
Sowing and Growing
Technical Details
Seeds per packet: 75
Family: Asteraceae
Scientific name: Ageratina altissima (Eupatorium rugosum)
Life cycle: Perennial
Hardiness zone: 3
Soil type: Sandy to clayey
Soil moisture level: Dry to wet
Soil - additional attributes: Well-drained, rich in humus
Light: Partial shade, shade
Blooming: July to September
Spacing: 35 cm
Height: 30 to 120 cm
Deer resistance: Moderate
Stratification: 60 days
Scarification: No
Germination time:
Sowing depth: Surface